Salesforce - Priscilla Hong

Question 1:

Refer to the code below:

01  const monthName = 'July';

02  const year = 2019;

03  if (monthName === 'July') {

04      year = 2020;

05  }

A developer receives feedback from the Tech Lead that the code gives an error.

Which line edit should the developer make so this code runs?

A.    03 if (monthName === July) {

B.    02 const year = '2019';

C.    02 let year = 2019;

D.    03 if (monthName == July) {

Answer: C

Question 2:

A developer uses the code below to format a date.

01  const date = new Date(2020, 11, 10);

02  const dateDisplayOptions = {

03      year: 'numeric',

04      month: 'long',

05      day: 'numeric'

06  };

07

08  const formattedDate = date.toLocaleDateString('en', dateDisplayOptions);

After executing, what is the value of formattedDate?

A.    December 10, 2020

B.    November 11, 2020

C.    October 11, 2020

D.    November 10, 2020

Answer: A

Question 3:

Refer to the code below:

01  let foodMenul = ['Pizza', 'Burger', 'French fries'];

02  let finalMenu = foodMenul;

03  finalMenu.push('Garlic bread');

What is the value of foodMenul after the code executes?

A.    ['Garlic bread', 'Pizza', 'Burger', 'French fries']

B.    ['Garlic bread']

C.    ['Pizza', 'Burger', 'French fries', 'Garlic bread']

D.    ['Pizza', 'Burger', 'French fries']

Answer: C

Question 4:

Considering type coercion, what does the following expression evaluate to: true + 3 + '100' + null?

A.    '3100null'

B.    104

C.    4100

D.    '4100null'

Answer: D

Question 5:

Given two expressions var1 and var2, what are two valid ways to return the concatenation of the two expressions and ensure it is a data type string? Choose 2 answers

A.    String.concat(var1 + var2)

B.    String(var1).concat(var2)

C.    var1.toString() + var2.toString()

D.    var1 + var2

Answer: A, C

Question 6:

Refer to the code snippet below:

01  let array = [1, 2, 3, 4, 4, 5, 4, 4];

02  for (let i = 0 ; i< array.length; i++) {

03      if (array[i] === 4) {

04        array.splice(i, 1) ;

05        i--;

06      }

07  }

What is the value of array after the code executes?

A.    [1, 2, 3, 4, 4, 5, 4]

B.    [1, 2, 3, 4, 5, 4, 4]

C.    [1, 2, 3, 5]

D.    [1, 2, 3, 4, 5, 4]

Answer: C

Question 7:

Refer to the code below:

const pi = 3.1415926;

What is the data type of pi?

A.    Float

B.    Decimal

C.    Double

D.    Number

Answer: D

Question 8:

A developer has the following array of student test grades:

let arr = [7,8,5,8,9];

The teacher wants to double each score and then see an array of the students who scored more than 15 points.

How should the developer implement the request?

A.    let arr1 = arr.map( ( num ) => num * 2 ).filter ( (val ) => val > 15);

B.    let arr1 = arr.mapBy( (num ) => {return num * 2 } ).filterBy ( (val ) => {return val > 15 });

C.    let arr1 = arr.map ( (num) => {num * 2}).filterBy((val) => {val >15});

D.    let arr1 = arr.filter((val) => { return val > 15} ).map((num) => { return num * 2});

Answer: A

Question 9:

Refer to the following array:

let arr = [1,2,3,4,5];

Which three options result in x evaluating as [3, 4, 5]? Choose 3 answers

A.    let x = arr.filter((a)=> { return a>2 });

B.    let x = arr.slice (2, 3) ;

C.    let x = arr.splice (2, 3) ;

D.    let x = arr.filter((a) => { a< 2 });

E.    let x = arr.slice (2) ;

Answer: A, C, E

Explanation: The slice() method returns a shallow copy of a portion of an array into a new array object selected from start to end (end not included) where start and end represent the index of items in that array. The original array will not be modified. The filter() method creates a new array with all elements that pass the test implemented by the provided function. The splice() method changes the contents of an array by removing or replacing existing elements and/or adding new elements in place.

Question 10:

Given the following code:

01  let X = null;

02  console.log(typeof x);

What is the output of line 02?

A.    null

B.    x

C.    object

D.    undefined

Answer: C